You got me, I know almost nothing about voip. It's one of those things I planned to research at a later date, but this topic made me curious if this particular service at $1 a month would do what I need.

All I know is comcast cut the phone line coming into my house (they should have just unhooked it so a landline could be easily put back in the future), and they ran a phone cord from the new cable modem into a phone jack in the house. All phone jacks in the house work normally just like a land line, and I can send/receive faxes on my fax machine.

The $1 a month service wouldn't require the FXO card. If you decide to just use the comcast line, you'll need the FXO card. Their is another thread on the forum that discusses the Sangoma B600D and the x100p card.